Safety-envelop.



- 1. K. DALTON.

SAFETY ENVELOP.

APPLICATiON FILED DEC. 26. 19M.

Patented. July 27, 1915.

witneoow attorney,

JAME$F K. DALTON, F WAVERLY, OHIO.

sArE'rY-Envnmr.

intense.

specification of Letters Patent.

Patented July 2'7, 1915.

Application filed December 26, 1914. Serial N 0. 879,172.

i art to which it appertains to make and use the same, referencebeing-had to the on'ipatz'iying drawings, and to the letters figures ofreference marked thereon, uch form a part of this specification.

This invention relates to new and useful .ii'nprovcn'icnts in safetyenvelops and the object in view is to produce a simple and dit-lentdevice of this nature so constructed that it will be impossible to openthe same without detection.

More specifically, the invention consists of an envelop in the back ofwhich a groove formed and adapted to contain an indelibio chemical oranalogous. material which will if subjected to steam or water, cause thsame to flow and disclose that the envelop has been tampered with.

The invention comprises various details of construction, combinationsand arrangements of parts which will be hereinafter fully described,shown in the accompanying drawings and then specifically defined in theappended claim. I

1 illustrate my invention inthe accompanying drawings, in which Figure iis a rear elevation of an envelop made in accordance with my invention,and Fig. is a cross sectional view.

ieference now being had to the details of the drawings by letter, Adesignates an envelop of an y shape or size and B is a groove formed inthe back thereof, preferably near the upper marginal edge and over whichthe flapC isadapted to be folded. Said groove, which in thepresentinstance is angular at its center, has a filler E therein of indeliblematerial and a covering D is fastened over the grooved face holding thefiller in place, and forming means whereby the indelible materialwill'not he accidentally spread in the event of a person moistening theenvelop to cause the adhesive material upon the flap to adhere to theenvelop.

In the event of an attempt being made to open the envelop by subjectingthe adhesive material upon the fiap to steam or water for the purpose ofloosening the sealing material, the moisture or steam will so'act uponthe indelible-material thatit will flow from the groove and spread, thusshowing that the envelop has been tampered with, it being understoodthat the strip of material D is of such a nature that moisture willreadily pass through the same when the envelop is subjected ,to water orsteam.

What I claim to be new is I A safety envelop having a groove,longitudinally angled, impressed in the rear thereof, the ends of thegroove terminating slight distances from the ends of the upper edges ofthe back adjacent to the ends, a filler within said groove and flushwith the rear face of the envelop, a sealing flap of the envelop adaptedto fold over and close said groove its entirelength and seal to theback. v In testimony whereof I hereunto affix my signature in presenceof two Witnesses. JAMES K. DALTON. Witnesses:

JOHN YOHRAUS, I M. C. Dacron.

